Each pencil contains superior pigments of unsurpassed lightfastness (resistance to fading), which is rated on each pencil. Albrecht Durer colored pencils are available in 120 colors that are part of a unique color matching system that encompasses all Faber-Castell Art & Graphic products. Buttery smooth color laydown, easily blended and layered, no waxy build up. SV Bonding to strengthen lead and prevent breakage. Thick 3.8mm leads. 100% Water soluble.